The Journey Down: Chapter One

I'm trying to play this on Mac and the game starts okay and reaches the main screen and plays music. However, as soon as the little steam icon pops up in the corner to says "press SHIFT TAB to access the steam community...", the screen goes blank. Music carries on but I can't click anywhere or press any keys. I then have to force quit the application. Weird thing is, if I find the app location on my disk and try to run it directly (not via steam) it works fine. Anyone know why this may happen?

I'm trying to play this on Mac and the game starts okay and reaches the main screen and plays music. However, as soon as the little steam icon pops up in the corner to says "press SHIFT TAB to access the steam community...", the screen goes blank. Music carries on but I can't click anywhere or press any keys. I then have to force quit the application. Weird thing is, if I find the app location on my disk and try to run it directly (not via steam) it works fine. Anyone know why this may happen?

I also had this or a very similar problem, but I'm on a old Mac Pro tower with a NVIDIA GeForce 8800 GT, not a laptop with integrated graphics.

There's another game I have a similar problem with (ToME), and turning off the Steam Overlay helped there. I'm about to try that here, and I'll update with the result. It helped here, too. No issues at all with the overlay off.